FT-IR, Raman and thermoluminescence investigation of P2O5–BaO–Li2O glass system

The 0.5P2O5·xBaO·(0.5−x) Li2O glass system (0 ⩽ x ⩽ 0.5 mol%) is investigated by FT-IR, Raman and thermoluminescence as a possible dosimetic material. FT-IR and Raman spectra show structural network modifications with the composition variations of the studied glasses. The predominant absorption band from IR spectra is attributed to the symmetric stretching vibrations of P = O double bonds. Raman spectra of the studied glasses contain also typical phosphate glasses bands. Thus the band at ∼700 cm−1 is assigned to symmetric stretching vibrations of P–O–P groups and that from ∼1158 cm−1 is attributed to symmetric stretching motions of the non-bridging oxygen (NBO) atoms bonded to phosphorous atoms (PO2) in phosphate tetrahedron. Finally FT-IR and Raman spectroscopies revealed a local network structure mainly based on Q2 and Q3 tetrahedrons connected by P–O–P linkages. Luminescence investigations show that by adding modifier oxides to phosphate glass dose dependent TL signals result upon irradiation. Thus P2O5–BaO–Li2O glass system is a possible candidate material for dosimetry in the high dose range (>10 Gy).